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anywhere. At least this assumption is tenable. The future of Web apps depends on whether it is flexible enough to have all the benefits of accomplishing tasks on the web, and to accomplish these tasks offline. Enabling offline applications is now achievable.--HTML5 provides performance such as application caching and client-side storage (for example, local storage, indexed databases) so that your application can work when there is no network connect

column that always starts with 1, and Oracle thinks rownum> N (the natural number of n>1) is still not tenable, So I can't find the records. Sql> Select Rownum,id,name from student where RowNum >2; No rows selected How can we find the record after the second line? You can use the following subquery methods to resolve. Note that the rownum in the subquery must have an alias, or the record will not be detected, because rownum is not a column of a ta

conditional expression. -D: Test for Directory (directory). -E: Test whether the directory or file exists (Exist). -F: Test for file. -R: Tests whether the current user has permission to read (read). -W: Tests whether the current user has permission to write (write). -X: Tests whether the current user can perform (excute) the file. -L: Tests whether a symbolic connection (link) file. After the conditional test operation is performed, the predefined variable "$?" is used. The return stat

condition is not tenable. Given conditions called cyclic conditions, repeated execution of the program segments is called the loop body. C language provides a variety of loop statements, which can form a variety of different forms of the loop structure. While statement The general form of a while statement is a while (expression) statement in which the expression is a loop condition and the statement is a loop body.The semantics of the while statem

are crawling every page, Waiting for a certain period of time is to be able to analyze which pages do not have the update degree, there is no update of the page after the visit will be more and more long period. So the next time spiders come to visit will skip these links, then you add nofollow said that saving time is in fact completely not tenable. is it useful to nofollow out duplicate links? The answer is no, because spiders will be the site's

To correctly understand the meaning of static when applied to an inner class, it is important to remember that the object of the inner class defaults to the handle of an object of the encapsulated class that created it. However, if we say that an inner class is static, this argument is not tenable. The static inner class means: (1) To create an object of a static inner class, we do not need an external class object. The (2) cannot access an external

A randomly generated 100BCell population, how many of them are Pareto optimal solutions. My answer is few, almost 0, and occasionally one or two, and I obviously feel like I'm mistaken somewhere. We say that Bcell A is better than Bcell B when and only if a is not inferior to B on each target and at least one target is better than B, which is the definition of Pareto optimal solution. Therefore, the non-inferior solution in a group must be superior to the other, such as 99 individuals, the proba

then Re-identification. At present, most Re-id work assumes two points: 1) Given the gallery of pedestrian boundary. 2) Border Converse Hand-drawn. This will have a very good detection accuracy. In practice, however, these two assumptions are not tenable. On the one hand, gallery size will change with detector threshold. Low thresholds generate more bounding boxing (larger gallery, higher recall, but lower precision), and vice versa. The accuracy of

appiumlibrary selection of Time Controls App automation testing, for the sliding time control, very complex to judge more things.I'll write a previous example: First look at the picture of this control: how do we go about setting it to the specified time. Here we can see that there are four boxes that can be scrolled, and we also need to consider the current time factor.The current time can be obtained from this text on the page: March 23, 2017 15:50We store it in a variable and then use Pytho

. (first from left to right, a great independent set of V1, by definition, if added vertices, then not independent, that is, with V1 points in the adjacency, to meet the ruling set definition, proof; from right to left, a separate set V1 is the dominating set, for any vertices that do not belong to the V1, are adjacent to the vertex in V1, so it is ） ④ If there is no isolated vertex in graph G, the maximal point independent set of G is the minimum dominating set of G, and the inverse propositio

Preface using assertion exception and log processing Preface Make sure your error message can help you debug errors, not just to remind you that you need debugging errors. using Assertions Each block of code is built on a myriad of hypothetical platforms-some of which must be correct in order for the results to match expectations. Often the flaw arises because some assumptions are not tenable or are wrong. It is not possible and meaningless to avoi

and logical judgments are correct, so return to normal.When entered and 1=2 , the SQL statement is executed in the background:select * from There is no syntax error but the logic is false, so the error is returned.Let's use the assumption: if this is a character injection, we should have the following when we enter the above statement:select * from The query statement converts and statements all to a string, and does not have the logical judgment of and, so the above results do not appear, so t

"It's hard to believe that Java can be as fast as C + + or even faster." ” According to my own practice, this statement is indeed tenable. However, I have also found that many of the doubts about speed come from some early implementations. Since these methods are not particularly effective, there is no model for reference and cannot explain why Java is fast. The reason I think about speed is partly due to the C + + model. C + + puts its focus on eve

not 0. So how do we deal with this situation? The most common solution is to escape the input values and operate as follows:$name =addslashes ($name);$password =addslash3s ($password);After this operation, you can circumvent the "or ' 1 ' = ' 1" attack; The reason is simple because the Select query statement becomes as follows: Select COUNT (*) from the account where name= ' aaa ' and password= ' 112\ ' or \ ' 1\ ' =\ ' 1 ';the user's ' AAA ' password in the database is obviously unlikely to be

Today, a Java multi-machine deployment of scheduled tasks under the processing scheme.Requirements : There are two servers deployed with the same set of code, the code is written with spring's own scheduled tasks, but each time the execution of a scheduled task requires only one machine to execute.When I got this demand, I was in my head. Two simple solutions: Using IP to judge, two machine IP must be different, specify the IP of a machine to run. Code that deploys timed tasks on on

first, the circulation　　1. Indefinite circulation　　There are two kinds of forms: while [Condition] state in parentheses is the beginning of the loop of the judgment do done do is the end of the loop　　When the condition condition is established, the cycle isThe condition of condition is not tenable until it stops.until [Condition] Do Procedure paragraph Done　　When the condition condition is established, the cycle is terminated, otherwise it last

" because the Bayesian classification only makes the most primitive and simplest hypothesis--1, and all the characteristics are statistically independent; 2, all the characteristics of the same position. So if a sample x has A1,..., am properties, then there are:P (x) =p (a1,..., am) = P (A1) *...*p (AM)Naive Bayesian classification originates from classical mathematics theory, has a solid mathematical foundation, and stable classification efficiency, its advantage is the algorithm is simple, th

iOS training------My C language notes, look forward to communicating with you! #include intMain () {//logic and Conditions 1 conditions 2 /*The result of the operation is only 1 if both condition A and condition B are true, and the result of the rest is 0, which is false. Therefore, if a condition A or condition B is not tenable, the result is 0, that is, "false"*//*If condition A is established, then the condition B is established: If condition B

#includeintMain () {//logic and Conditions 1 conditions 2 /*The result of the operation is only 1 if both condition A and condition B are true, and the result of the rest is 0, which is false. Therefore, if a condition A or condition B is not tenable, the result is 0, that is, "false"*/ /*If condition A is established, then the condition B is established: If condition B is established, the result of "condition a condition B" is 1, that is, "tr

, exponential time complexity algorithm) called NP (non-deterministic polynomial, non-deterministic polynomial) problem .In general, polynomial level complexity is acceptable, many problems have polynomial-level solutions-that is, the problem, for a size is n input, in n^k time to get results, called P problem. Some problems are more complicated, there is no polynomial-time solution, but you can verify that a certain guess is correct in polynomial time. Like asking if 4294967297 is prime? If yo